Welch Kevin D, Stonecipher Clint A, Gardner Dale R, Panter Kip E, Parsons Cory, Deboodt Tim, Johnson Bryan
Poisonous Plant Research Laboratory, United States Department of Agriculture - Agricultural Research Service, Logan, UT, United States.
Poisonous Plant Research Laboratory, United States Department of Agriculture - Agricultural Research Service, Logan, UT, United States.
Res Vet Sci. 2015 Feb;98:16-8. doi: 10.1016/j.rvsc.2014.12.010. Epub 2014 Dec 16.
Numerous evergreen trees and shrubs contain labdane acids, including isocupressic acid, which can cause late-term abortions in cattle. Recent research has shown that the bark from western juniper trees can also cause late-term abortions in cattle. Additionally, ranchers have observed that cattle in western juniper-infested rangelands tend to have decreased conception rates. The objective of this study was to determine if western juniper alters the estrous cycle of cattle. Fourteen heifers (10 treated and 4 control) were monitored for 74 days for signs of normal estrous behavior, with a 21 day feeding trial with western juniper bark from days 28-48, after which the cattle were bred naturally with a bull. The cattle were checked for pregnancy 30 days after all cattle had been bred. The data from this study indicate that exposure to western juniper bark does not affect normal estrus, estrous cycle or conception rates of cattle.
许多常绿乔木和灌木都含有半日花烷型酸，包括异柏酸，这种酸会导致牛发生晚期流产。最近的研究表明，西部桧柏的树皮也会导致牛发生晚期流产。此外，牧场主观察到，在西部桧柏肆虐的牧场中，牛的受孕率往往会下降。本研究的目的是确定西部桧柏是否会改变牛的发情周期。对14头小母牛（10头接受处理，4头作为对照）进行了74天的监测，观察其正常发情行为的迹象，并在第28至48天进行了为期21天的西部桧柏树皮喂养试验，之后让这些牛与公牛自然交配。在所有牛都交配后30天检查它们是否怀孕。这项研究的数据表明，接触西部桧柏树皮不会影响牛的正常发情、发情周期或受孕率。
